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Delta <br /> Env <br /> Consultants,onInc.Consultants, I <br /> 3330 Data Drive, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> 916/638-2085 <br /> FAX:916/638-8385 <br /> December 5, 1990 <br /> Ms. Laurie A. Cotulla, REHS <br /> Environmental Health Division <br /> Public Health Services <br /> San Joaquin County <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject: Site Code 1058124--Interstate Shell <br /> 620 West Charter Way, Stockton, California 94524 <br /> Shell WIC No. 204-7524-4305 <br /> Delta Project No. 40-88-586 <br /> Dear Ms. Cotulla: <br /> Delta Environmental Consultants,Inc.(Delta),has been investigating and monitoring the status of the <br /> subject site for Shell Oil Company since November 1988. The following is a summary of work reports <br /> related to the subject site which have been submitted to San Joaquin County: <br /> • November 1988 Soil Assessment Related to Removal of Underground Tanks <br /> • July 1989 Pretank Removal Soil Assessment <br /> • August 1989 Hydrogeological Assessment Work Plan <br /> • September 1989 Soil Management Plan for Tank Replacement <br /> • January 1990 Tank Closure Report <br /> • February 1990 Supplemental Data Report <br /> • March 1990 Interim (Free Product Recovery) Remedial Action Plan <br /> a <br /> • October 8, 1990 Status Report <br /> The Status Report mailed to Ms. Diane Lundquist, Shell Oil Company, with a copy `to Ms. Diane <br /> Hinson, San Joaquin County, dated October 8, 1990 (enclosed), summarized the status of the <br /> investigations completed to date, including monitoring well data and analytical results of groundwater <br /> samples collected in March and July of 1990.. This report included a description of the interim <br /> free-phase product recovery currently ongoing at the site and summarized the results of soil venting <br /> extraction testing and pump testing that had been conducted to provide data for the development of a <br /> detailed final remedial action plan. The status report included site maps showing the ground water <br /> gradient and the proposed installation of two additional off-site downgradient monitoring wells to <br /> further define the potential downgradient extent of hydrocarbon contamination. <br /> Practical Solutions to Environmental Concerns <br />